There's nothing mysterious about it. Just pointing out how much time the tiniest things in a development can take. I've spent 5 hours writing one dialogie with one companion for one act, and it's not even certain players would even ever touch that companion. Swen's saying that there's a very niche scenario where players will even get to experience what he's spent hours on considering, but even if mostly unseen, it still has to be made. #whyrpgstaketimetomake
It's like detailed terrain texturing and small clutter. You don't really think about it when it's there, but you notice it immediately if it's not. It's what I personally call the "unappreciated work", because few ever notices it. Such as that particular variation of a situation that ONLY occurs if you have two specific companions in your party. That's all there is to it, a little BG3 tease presumably with hints at attention to detail.
